Shaping or planing machine for worm or screw shaped bevel wheel operating according to the development method



` 1,636,120 July 19 1927' H. -BRANDENBERGER SHAPING OR PLANING MACHINE FOR WORM OR SCREW SHAPED BEVEL WHEEL OPERATING ACCORDING; T0 THE DEVELOPMENT kMETHOD l Eilednec. 21,1923 4 sheets-sheen 'July 19, 1927.

v 1,636,120 l H. BRANDENBERGER SHAPING OR PLANING MACHINE FOR WORM OR SCREW SHAPED BEVEL WHEEL OPERATING ACCORDING T0 THE DEVELOPMENT METHOD FiledDec. 2l. .1923 4 Sheets-Sheet 2 4 1,636,120 July. 19 .1927 H. BRANDENBERGER SHAPING OR PLANING MACHINE FOR WORM OR' SCREW SHAPED BEVEL WHEEL' OPERATING l ACCORDING T0 THE DEVELOPMENT METHOD Filed Dec. 21. 192:s 4 sheets-sheep 5 1 1,636,120 July 191927 H-BRANDENBERGER SHAPING OR PLANING MACHINE EOR WORM OR SCREW SHAPED BEVEL WHEEL OPERATING ACCORDING T0 THE DEVELOPMENT METHOD Filed Dec. 21. 1923 4 sheets-sheer*r Fly-7 llge?,

Patented July 19, 1927.

UNITED STATES 1,636,120 PATENT.;` OFFICE.

HEINRICH BRANDENBERGEB, 0F VIENNA, AUSTRIA.

SHAPING B PLANING MACHINE FOB WORM 0B SCREW SHAPED BEVEI..A WHEELA OPERATING ACCORDING T0 THE DEVELOPMENT METHOD.

Application led December 21, 1923, Serial No. 682,110, and in `Austria December 23, 1922.

This invention relates to a shaping or laning machine for wormor screw-shaped vel wheels operating according to the development method, in which the worm or screw shape of the teeth is developed by the relative movement between the straight line motion of the cutter and the continuously .rotating bevel wheel, so that the machine can operate without a dividing device. Hitherto in the known machines the additional stroke or lift of the tool produced by the developing motion of the plane wheelor pinion has not been taken into consideration, so that incorrectly shaped teeth were pro# duced. The present invention has for the object to remove this drawback.

VOne mode cf carrying out the present invention is shown-by way of example on the accompanying sheets of drawings in which- Fig. 1 is a longitudinal section through the machine,

Fig. 2 a plan view of the latter but partly in section according to line 2 2 of Fig. 1, and

Fi 3 a view of the tool-slide as seen in the irection of the arrow C of Fig. 1.

Fi 4 illustrates the surface of, the bevel whee las spread out in a plane withY the, curves, which the tool produces on the divid- Y ing cone.

Fig. 5 shows diagrammatically and by' way of example the drive or operation of thelcutting tool on the movable pinion or plane wheel.

Fig. 6 is an elevation of the machine looking in the direction opposite to that indicated by the arrow C in Fig. 1.

Figs. 7 to 10 are diagrammatic views illustrat-ing the manner in which the positive connection between the work piece and tool according to the rotation` of the plane wheel, can be influenced.

A shaft 2 with a driving pulley 3 is located on the pinion-casing 1. A worm 4, secured upon the shaft 2, meshes with a worm wheel 5 which is keyed to a crankshaft 6, the crank pin 7 of the latter moving by means of a'connecting rod 8 the crosshead 9, which operates the two rams 10 and rams (Fig. 3).

10'. Slide-supports 11 and 1'1', slides 12, 12', knife or cutter holders 13, 13 and the knives or-.cntters 14, 14' are mounted on the said Further a bevel wheel 15 (Fig. e ,meeting with a bevel wheel 16 keyed to t e shaft 17, is mounted on the shaft 2. The shaft 17 carries a spur gear wheel 18 which by means of the toothed wheels 19 and 19 is in connection with a gear wheel 20, keyed to a loose sleeve 21 (Fig. 1) which is mounted in the part 22 of the machine and serves as the bearing of a shaft 23. A wheel 24 mounted on the 'sleeve -211rotates the' shaft 23 through a spur wheel diferential gear. By the pair of bevel wheels 25 this rotationis transmitted to the spur wheel. 26 which by means of the wheels 27 and 28 and the pair of bevel wheels 29 operates the grooved shaft 30. A bevel wheel 31 is by means of a feather or key slidably mounted on the grooved shaft and the wheel 31 is in mesh with a bevel wheel 32 which by means of a shaft 34, disposed in the workpiece head stock, is connected with the worm 33. The workpiece is secured to the shaft 37 and by -means of the worm wheel 36 the latter is spur wheels 39, 40, 41 and 42. The worm 38 meshes with a worm wheel 44 (Fig. 1) which is fast with the faceplate 45' and thus produces the developing motion of the plate 45. The ram vguides 46 and 46 are movably screwed in a. circle to the plate 45 and the rams 10 and 10 move in the same, thus carrying out the developing motion of the face plate.

Further the spur'wheel 47 is mounted on the shaft 43 and is in connection with the shaft 49 by means of the ar wheels 48, a worm wheel 50 being-keye to the shaft 49 and meshing with a planet wheel casin 51 provided with a worm wheel toothin kwhereby the workpiece 0n the shaft 37 wi l have imparted thereto,.besides the rotation of the main drive, an additional'rotaton, depending upon the face plate motion, e. g., the development movement. l

If the cutter-drive, e. g. the worm 4 would carry out the development movement of the face lato. 45, the knives or cutters 14, 14 woul ition to the plate 45. Now as the worm 4 1s fixed and does not carry out the development movement, the knives 14 and 14 rercmain always in the same relative' the crank (O Z) with respect to t ceive during the movement of the facedisc an additional stroke or lift.

In Fig. 4 by which this is explained, O S is the path of the point K which corresponds to the pin of the cross ead 9 of the machine) on the plane wheel or' face plate, O being the axis of the crank shaft 6, Z the centre of the crank pin 7, thus K Z corre'-I sponds tothe connecting rod 8. S is the common point ofthe cone of the work-piece and plane wheel. The developed surface of the work-piece is indicated below O S. 'The rotation of the work-piecefor producing the worm teeth may be displaced or substituted by a rotation of the developed surface about S. Now the point K describes during its toand fro movement along O S on the workpiece a curve a. The dead centre position O Z0 K0 corresponding to the point P1, ofthe curve a, a crank position O Z1 K1 to the point P1 in which. the tooth-curve on the wheel shall actually commence. Now if the plane wheel and work-piece have rolled off or developed for a certain extent, the point K would have to describe the same curve as before in order that theoretically correct teeth will be produced on the work-piece.

This would mean that for the position of the a surface ofthe workepiece. determined by the straight P1 S also the crank position O Z1 is again present. This would be the case if, as above indicated, the crank drive would carry out this development movement with the plane wheel. In practice this is not the case, the worm H does not move and thus during the rolling off or development movement of the plane wheel this is relatively rotated towards 4 and 5, therefore against the tool drive to the point 7 (Z). 4The cross-head guide'carries out the' plane wheel movement and the crank O Z not, e. g. the lposition of p e connecting rod (Z K) will be different as before. Therefore not any more the crank position O Z1 K1 but the position O Z2 K2 will correspond-'to the position S P1, as on the plane wheel relative to the same' the dead centre osition of the crank will 4be different.

herefore just now the curve will be demovement 'of the tool, e. g. rthe pro ucing plane wheel, rolling off or development movement of the work-piece or cutting movement of the tool.

Since every rotary motion of Kthe crank drive 7 of the tools 14 and 14 corresponds toV a rotary motion of the work-piece on 37, the development movement corresponding to the movement of the plane wheel 45 ma be imparted to the tools 14, 14 insteac of the `whether the rotary motion of the work-piece or the cutting movement of the tool, is increased by the development movement. If the development movement is transferred to the tools, the same may be combined with the above mentioned additional rotation and the cutting movement may be influenced by a differential. In the illustrated embodiment the additional lifting motion which arises during the development movement has been compensated for by an additional rotation of the work-piece and combined with the development movement vof the workpiece, which is expressed in the calculation of the gear wheels 47, 48.

The additional rotation of the workpiece including its developlment movement is produced by the spur w eel differential gear 51.

Also the tool drive may be formed in such a manner, that the additional lifting movement doesnot arise, e. g. the additional compensating movement is transferred into the tool drive.

In Fig. 7 the actuating mechanism of the machine is diagrammatically illustrated; e is the tool driving crank pin disc, f the plane wheel, and g the work piece drive. A double arrow indicates the reciprocating movement of the cuttin tool or tools which is effected by the pin of the crank disc e.

According to the working principles of the machines wherein the work piece is continuously rotated, the tool drive'e and the work piece drive g must be coupled with each other by a positive connection, for in-' stance, gears which are driven from the outside from any source of power.

When, according to the amplitude of the feeding movement, the plane wheel f is rotated, the work drive g must be entrained into the rolling off or development movement which is effected in a known manner, for instance, by a toothed segment or as indicated, for example, in the embodiment Figs. 1-3 by change speed gears in connection with a planetary gear, whereby, according to the rotation of the plane wheel, the additional development movement or rolling-off movement is imparted to the work piece. This, again, is indicated diagram- `matically in Fig. 8.

As each turning movement of the work piecel corresponds to a turning movement of the tool, it is pointed out that instead of imparting the rolling-off vor development movement to the work piece, it can beimparted to the tool. t

As the drive of the tool at e is entrainedV in the rotary movement of the plane wheel, the tool would, in a movement of the plane wheel,perform an additional stroke which lli crank quadrangle.

is lavoided according to the present invention. The stroke movement which is caused by thel rotation of the plane wheel f in the crank drive is compensated, accordin to the invention, the positive connection tween the work piece and lthe tool being influenced according to the rotation between the work piece and tool. lConstructively, this can be achieved in various manners. In Fig. 5. for example, an embodiment is shown, in which the drive of the tools is effected through a Fig. 5 shows a referable construction.

O is the axis ot the lane wheel, A the' centre of driving gear w ieel disposed in the fixed place, D tie centre of the gear wheel vmounted onthe plane wheel, from which the tool-crank is driven. A Band D B indicate the cranks movably disposed at both sides on which the gear wheels a, b, c, d are arranged. The lengths of the cranks are such, that the point of rotation A, B, D and the axis O of the plane wheel` form a parallelogram. Now if the plane wheel rotates about the axis O and if for instance D is rotated to D1, the crank point B will be moved to B,l in such a manner, that A B1 D1 and O always form a parallelogram. The numbers ofteeth of the wheels a, b, c, d may be such, that when the wheel a is at a standstill (opposite the fixed place) the plane wheel is'moved (for instance from D.

to D1) `without that the wheel d will rotate with respect to the plane wheel.

' In order to determine for this preferable construction the proportion between the number of teeth, which satisfies this condi- .l tion it has to be imagined at first, that the wheels b, c, d are fast on B D and the plane wheel is rotated through the angle 4 now the wheel d is moved back for the angle qi,

Iso that it will come into the original position with respect to the pla-ne wheel. In order to bring the toothed wheel a with respectto the fixed place into the same position, first the wheel b is turned back for the angle so that the two wheels a and o will come into engagement with the original teethand now the wheel a is turned for the angle into its former position (with respect to the fixed place). As the rotations with which the wheel b is imparted by the rotations of the wheels d and a are to be alike, the following conditions may be made lco incase a, b, d indicate the diameters of the vpitch circles of the corresponding wheels.

. a condition which can be easilysatisfied.

vThe additional movement ofthe tool or cordingto the rotation of the plane wheel,

the cranks A; B and B D, Fig. 5, are also turned, so that the wheels, a, b, c, d, mounted thereon, which represent a part of the posi- `-live connection between work piece and tool, are influenced according to the rotation (or angle of. rotation) of the plane wheel. It is also possible to lead the tool drive over a planetary gear-drive, and to impart to the planetary gear-drive a certain rotation according to the rotation of the plane wheel, so that the positive connection between work piece and tool is influenced according to the rotation of the plane wheel.

The constructions which have been described at first as examples are diagrammatically illustrated by Fig. 9, in pwhich L designates a crank quadrangle or planetary gear-drive or another mechanism which is suitable to compensate the additional movement of the tool, causedby the movement of the plane wheel by influencing the positive connection .between work piece and tool, according to the rotation of the plane wheel. The influencing of the positive connection between work piece and tool, according to tool may be influenced bya mechanism, forinstance, a differential at W, while the plane l the rotation of the plane Wheel achieved in wheel N is driven under consideration of the additional movement of the tool. Further,

the drive may be constant at V, and the additional movement may be considered at W. In any case, the positive connection between work piece and tool is influenced according to the rotation of theplane wheel. It is'to be pointed out that it is, in'principle, immaterial at which point a positive connection t of the drives is started.

Having now particularly described and ascertained the nature of xmy said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a spiral bevel Wheel planing machine operating according to the development method, means for continuously rotating a work piece, a plane wheel, a tool, means for giving additional movement to the tool, the

additional movement of the tool caused by i the movement of .the plane wheel being so compensated that the combined or interconnected movements of the work piece and of 'l the work tool are changed in their respective.

relation according to rotation of the "plane 15,1;

wheel.

2. A machine as claimed in claim i, darli-'1:'

acterized by the fact that the drive of the tool `is such as to preventa -rel'ative adjustment of the tool with respect to the plane wheel during its` rolling'off or development movement.

3. A machine as claimed in claim 1, characterized by the fact, that the additional compensating movement and the rolling oif or development movement of the work-piece or of the tool is combined with one of the three drives by oneI and the same gear.

4. A machine as claimed in claim l, characterized by the fact, that the driving or actuation of the tool from the fixed part to the movable plane wheel is effected by spur lvvheels,- whose axes are parallel to that of the plane Wheel and which are arranged on two movable cranks or on connecting. rods unit ing the same, whereby the centres or the spur wheels in the three end points of the cranks and the fourth 'centre of the' axis of the plane Wheel coinciding with the end point of the crank form the corners kof aparallelogram.

In testimony whereof signature. f

HEINRICH BRANDEN BERGER.

I hereunto aix my 

